Novel voltage drop design method for integrated power distribution network

Abstract

The invention discloses a novel voltage drop design method for a comprehensive power distribution network, which is characterized in that the total voltage drop allowable value from a voltage source to any equipment terminal point in a system is within 6%, and the method comprises the following steps: step 1, the voltage drop allowable value of a main incoming cable is 1.5%; step 2, a voltage drop allowable value from a module high-voltage main distribution board (2) to a transformer or a high-voltage equipment end is 4.5%; and step 3, the allowable value of the voltage drop from the module transformer (3) to the module load (4) or the lower-level transformer is 6%. According to the novel voltage drop design method for the comprehensive power distribution network, the voltage drop from each stage of power supply loop to the whole power supply loop is effectively controlled through systematic step-by-step and section-by-section division, the model selection cost of cables and power distribution switches is controlled, the design practicability and operability are very high, precise line control is very high, and the system design accuracy and economic practicability are enhanced.

Description

Technical Field

[0001] The invention relates to a novel voltage drop design method for an integrated power distribution network. Background Art

[0002] In the design of power generation, transmission, distribution and use schemes in large-scale integrated power distribution network systems, in order to ensure that the power supply voltage of power-consuming equipment can meet the equipment operation requirements, the steady-state voltage drop of the power grid is calculated to verify whether the selected design meets the voltage drop requirements. Therefore, the calculation of line voltage drop is a must for loop design and cable selection to meet the requirements. All major classification societies have clear allowable value ranges for voltage drop. On the basis of considering meeting the requirements of the specifications, how to make the design more accurate, more economical and more reasonable requires further detailed design method research and innovation. Summary of the invention

[0003] The purpose of the present invention is to provide a novel voltage drop design method for an integrated power distribution network.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a new voltage drop design method for an integrated power distribution network, wherein the total voltage drop from the voltage source to any terminal point of a device in the system is allowed to be within 6%, comprising the following steps: Step 1: The allowable voltage drop of the main incoming cable is 1.5%, that is, the allowable voltage drop from the module main generator (1) to the module high-voltage main switchboard (2) is within 1.5%; Step 2: The allowable voltage drop from the module high-voltage main distribution board (2) to the transformer is 4.5%, and the allowable voltage drop from the module high-voltage main distribution board (2) to the high-voltage equipment end is 4.5%; Step 3, the voltage drop from the module transformer (3) to the first module distribution panel (5) is allowed to be within 1.5%, and the voltage drop from the first module distribution panel (5) to the module load (4) is allowed to be 4.5%. The segmented voltage drop is allowed to be 1.5% and 4.5% respectively, and the total voltage drop is controlled to be within 6%; Step 4: The voltage drop from the module transformer (3) to the first module distribution panel (5) is allowed to be within 1.5%, the voltage drop from the first module distribution panel (5) to the module distribution box (6) is allowed to be within 2%, and the voltage drop from the module distribution box (6) to the module load (4) is allowed to be within 2.5%. The allowable values ​​of the segmented voltage drop are controlled to be 1.5%, 2%, and 2.5% respectively, and the total voltage drop is controlled to be within 6%; Step 5, the voltage drop from the module transformer (3) to the first module distribution panel (5) is allowed to be within 1.5%, the voltage drop from the first module distribution panel (5) to the second module distribution panel (7) is allowed to be 1.5%, and the voltage drop from the second module distribution panel (7) to the module transformer (3) is allowed to be within 3%. The allowable values ​​of the segmented voltage drop are controlled to be 1.5%, 1.5%, and 3% respectively, and the total voltage drop is controlled to be within 6%; Step 6, the allowable voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, the allowable voltage drop from the third module distribution board (8) to the remote module distribution box (9) is 3% adjustable, and the allowable voltage drop from the remote module distribution box (9) to the module load (4) is 2% adjustable. The allowable voltage drop values ​​of the controlled segments are 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled within 6%; Step 7, the allowable value of the voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, the allowable value of the voltage drop from the third module distribution board (8) to the near-end module distribution box (10) is 0.5%, the allowable value of the voltage drop from the near-end module distribution box (10) to the module junction box (11) is 3% adjustable, and the allowable value of the voltage drop from the module junction box (11) to the module load (4) is 2% adjustable. The allowable values ​​of the segmented voltage drop are controlled to be 0.5%, 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled to be within 6%; Step 8: The allowable voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, and the allowable voltage drop from the third module distribution board (8) to the module load (4) is 5.5%. The allowable voltage drops in each section are controlled to be 0.5% and 5.5% respectively, and the total voltage drop is controlled to be within 6%.

[0005] In step 2, the allowable voltage drop from the module high-voltage main distribution board (2) to the transformer is 4.5%, that is, the allowable voltage drop from the module high-voltage main distribution board (2) to the module transformer (3) is 4.5%, and the allowable voltage drop from the module high-voltage main distribution board (2) to the hull transformer (14) is 4.5%.

[0006] In step 2, the allowable voltage drop from the module high-voltage main distribution board (2) to the high-voltage equipment end is within 4.5%, that is, the allowable voltage drop from the module high-voltage main distribution board (2) to the module load (4) is within 4.5%.

[0007] Another technical solution adopted by the present invention to achieve the above-mentioned purpose is: a new voltage drop design method for an integrated power distribution network, wherein the total voltage drop from the voltage source to any terminal point of a device in the system is allowed to be within 6%, comprising the following steps: Step 1: The allowable value of the voltage drop of the main incoming cable is 0.5%, that is, the allowable value of the voltage drop from the hull main generator (12) to the hull main switchboard (13) is within 0.5%, and the allowable value of the voltage drop from the hull transformer (14) to the hull main switchboard (13) is within 0.5%; Step 2: The voltage drop from the ship's main switchboard (13) to the junction box (15) is allowed to be within 1.5%, the voltage drop from the junction box (15) to the ship's load (17) is allowed to be within 4%, the voltage drop on the power supply side is 0.5%, and the voltage drop in the power supply section is allowed to be 1.5% and 4% respectively, and the total voltage drop is controlled to be within 6%; Step 3: The voltage drop from the ship's main switchboard (13) to the starter (16) is allowed to be within 1.5%, the voltage drop from the starter (16) to the ship's load (17) is allowed to be within 4%, the voltage drop on the power supply side is 0.5%, and the voltage drop in the power supply section is allowed to be 1.5% and 4% respectively, and the total voltage drop is controlled to be within 6%; Step 4, the voltage drop from the hull main switchboard (13) to the hull load (17) is within the allowable value of 5.5%; Step 5: The allowable voltage drop from the ship's main switchboard (13) to the ship's distribution box (18) is within 0.5%, the allowable voltage drop from the ship's distribution box (18) to the ship's load (17) is within 5%, and the allowable voltage drop of the power supply section is 0.5% and 5% respectively, and the total voltage drop is controlled within 5.5%; Step 6: The allowable voltage drop from the ship's main distribution board (13) to the ship's distribution box (18) is within 0.5%, the allowable voltage drop from the ship's distribution box (18) to the junction box (15) is within 2.5%, and the allowable voltage drop from the junction box (15) to the ship's load (17) is within 2.5%. The allowable voltage drop values ​​for the power supply sections are 0.5%, 2.5%, and 2.5%, respectively, and the total voltage drop is controlled to be within 5.5%.

[0008] The present invention discloses a novel voltage drop design method for an integrated power distribution network. On the basis of meeting the voltage drop standard required by the specification, it is different from the conventional voltage drop calculation method in that the voltage drop requirements are systematically graded and then considered as a whole. In each level, the voltage drop of each section is evaluated according to the power size of the actual power grid equipment layout, and the voltage drop range requirement value of each section is adjusted. The advantages of this voltage drop method are obvious in large-scale integrated power distribution networks. Each section has strong operability, and the voltage drop between the power supply end generator and the distribution board is usually very small. However, more often, in the power transmission and distribution process, the cable from the intermediate panel and the intermediate junction box to the terminal equipment is too long, and there are also many cables from the junction box to the terminal equipment. In this case, the allowable value of the voltage drop at the front end of the compression can be reduced, leaving more allowable voltage drop range space for downstream equipment, thereby effectively controlling the cost of selecting the cable specifications for the terminal equipment. From saving cable selection to saving upper distribution box switch selection, it has very important design significance, has strong precise line control, and enhances the accuracy of system design and economic practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a first embodiment of a novel voltage drop design method for an integrated power distribution network of the present invention.

[0010] Figure 2 It is a structural schematic diagram of a second embodiment of a novel voltage drop design method for an integrated power distribution network of the present invention.

[0011] In the figure: 1. Module main generator; 2. Module high voltage main distribution board; 3. Module transformer; 4. Module load; 5. First module distribution board; 6. Module distribution box; 7. Second module distribution board; 8. Third module distribution board; 9. Remote module distribution box; 10. Near module distribution box; 11. Module junction box; 12. Hull main generator; 13. Hull main switchboard; 14. Hull transformer; 15. Junction box; 16. Starter; 17. Hull load; 18. Hull distribution box. DETAILED DESCRIPTION

[0012] According to the requirements of the specification, the voltage drop range value is allowed for the integrated distribution network from the distribution board bus to any terminal equipment installation point in the system. The power system voltage drop is controlled within 6% of the nominal voltage. The battery power supply voltage does not exceed 50V circuit, and the voltage drop can be increased to within 10% of the nominal voltage value requirement. In the system design, the entire distribution network is implemented in accordance with this requirement, and the system reliability is quite high. However, at the same time, some design margins are too large, resulting in serious waste of design costs. The new voltage drop design method for the integrated distribution network of the present invention, based on the requirements of the specification and according to the specific distribution network configuration, conducts systematic level-by-level and segment-by-segment division, and defines the allowable range values ​​respectively. On the basis that the total circuit voltage drop range value meets the requirements of the specification, the allowable range value of the voltage drop of each sub-segment is flexibly adjusted according to the functions of each level including load size and equipment distance, so as to achieve the purpose of precise design for each segment and item.

[0013] Embodiment 1, as Figure 1As shown, the new voltage drop design method for the integrated distribution network has an allowable value of less than 6% of the total voltage drop from the voltage source to any terminal point of the equipment in the system, and includes the following steps: Step 1, the allowable value of the voltage drop of the main incoming cable is 1.5%, that is, the allowable value of the voltage drop from the module main generator 1 to the module high-voltage main distribution board 2 is within 1.5%; Step 2, the allowable value of the voltage drop from the module high-voltage main distribution board 2 to the transformer is 4.5%, that is, the allowable value of the voltage drop from the module high-voltage main distribution board 2 to the module transformer 3 is 4.5%, the allowable value of the voltage drop from the module high-voltage main distribution board 2 to the hull transformer 14 is 4.5%, and the allowable value of the voltage drop from the module high-voltage main distribution board 2 to the high-voltage equipment end is 4.5%, that is, the allowable value of the voltage drop from the module high-voltage main distribution board 2 to the module load 4 is within 4.5%. The above-mentioned module There is a certain distance between the main generator 1 and the module high-voltage main distribution board 2, and a range of 1.5% is given. The voltage sent to the transformer or load terminal can be considered as a stage. Considering that the high-voltage load is spread over the entire main deck module, the range is wide, and the remaining 4.5% range of 6% is considered; step 3, the voltage drop from the module transformer 3 to the first module distribution panel 5 is allowed to be within 1.5%, and the voltage drop from the first module distribution panel 5 to the module load 4 is allowed to be 4.5%. The segmented voltage drop allowable values ​​are 1.5% and 4.5% respectively, and the total voltage drop is controlled within 6%; step 4, the voltage drop from the module transformer 3 to the first module distribution panel 5 is allowed to be within 1.5%, and the voltage drop from the first module distribution panel 5 to the module distribution box 6 is allowed to be within 2%, and from the module distribution box 6 to the module load 4 voltage drop allowable value is within 2.5%, the control segment voltage drop allowable values ​​are 1.5%, 2%, 2.5% respectively, and the total voltage drop is controlled within 6%; step 5, the voltage drop allowable value from the module transformer 3 to the first module distribution panel 5 is within 1.5%, the allowable value from the first module distribution panel 5 to the second module distribution panel 7 is 1.5%, and the allowable value from the second module distribution panel 7 to the module transformer 3 is within 3%, and the control segment voltage drop allowable values ​​are 1.5%, 1.5%, 3% respectively, and the total voltage drop is controlled within 6%; step 6, the voltage drop allowable value from the module transformer 3 to the third module distribution panel 8 is 0.5%, the voltage drop allowable value from the third module distribution panel 8 to the remote module distribution box 9 is 3% adjustable, and the voltage drop from the remote module distribution box 9 to the module load The voltage drop allowable value of load 4 is 2% adjustable, and the control segment voltage drop allowable values ​​are 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled within 6%; step 7, the voltage drop allowable value from module transformer 3 to third module distribution board 8 is 0.5%, the voltage drop allowable value from third module distribution board 8 to near-end module distribution box 10 is 0.5%, the voltage drop allowable value from near-end module distribution box 10 to module junction box 11 is 3% adjustable, and the voltage drop allowable value from module junction box 11 to module load 4 is 2% adjustable, and the control segment voltage drop allowable values ​​are 0.5%, 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled within 6%; step 8, the voltage drop allowable value from module transformer 3 to third module distribution board 8 is 0.5%, and the voltage drop allowable value from third module distribution board 8 to module load 4 is 5.5%, the allowable values ​​of the segmented pressure drop are 0.5% and 5.5% respectively, and the total pressure drop is controlled within 6%.

[0014] Embodiment 2, as Figure 2 As shown in the figure, the new voltage drop design method for the integrated power distribution network has an allowable value of less than 6% of the total voltage drop from the voltage source to any terminal point of the equipment in the system, and includes the following steps: Step 1, the allowable value of the voltage drop of the main incoming cable is 0.5%, that is, the allowable value of the voltage drop from the hull main generator 12 to the hull main switchboard 13 is within 0.5%, and the allowable value of the voltage drop from the hull transformer 14 to the hull main switchboard 13 is within 0.5%. Since the hull main generator 12 and the hull main switchboard 13 are both arranged in the engine room at a short distance, the upper model The hull transformer 14 for stepping down the high-voltage power supply of the high-voltage main distribution board 2 is also arranged in the engine room close to the hull main distribution board 13. The voltage drop on the power supply side can be narrowed compared to the upper module power supply requirement range and is set to 0.5%; Step 2, the voltage drop from the hull main distribution board 13 to the junction box 15 is allowed to be within 1.5%, the voltage drop from the junction box 15 to the hull load 17 is allowed to be within 4%, the voltage drop on the power supply side is 0.5%, and the voltage drop allowable values ​​of the power supply segment are 1.5% and 4% respectively, and the total voltage drop is controlled within 6%; Step 3, The allowable voltage drop from the ship's main switchboard 13 to the starter 16 is within 1.5%, the allowable voltage drop from the starter 16 to the ship's load 17 is within 4%, the voltage drop on the power supply side is 0.5%, the allowable voltage drop of the power supply section is 1.5%, 4% respectively, and the total voltage drop is controlled within 6%; Step 4, the allowable voltage drop from the ship's main switchboard 13 to the ship's load 17 is within 5.5%; Step 5, the allowable voltage drop from the ship's main switchboard 13 to the ship's distribution box 18 is within 0.5%, and the voltage drop from the ship's distribution box 18 to the ship's load The allowable value of voltage drop at load 17 is within 5%, and the allowable values ​​of voltage drop in power supply sections are 0.5% and 5% respectively, and the total voltage drop is controlled within 5.5%; step 6, the allowable value of voltage drop from hull main distribution board 13 to hull distribution box 18 is within 0.5%, the allowable value of voltage drop from hull distribution box 18 to junction box 15 is within 2.5%, the allowable value of voltage drop from junction box 15 to hull load 17 is within 2.5%, and the allowable values ​​of voltage drop in power supply sections are 0.5%, 2.5%, and 2.5% respectively, and the total voltage drop is controlled within 5.5%.

[0015] The novel voltage drop design method for the integrated power distribution network of the present invention is based on the integrated power distribution network of a large FPSO (floating production storage and offloading unit), and studies and analyzes the novel voltage drop method for the upper module generator power distribution network and the hull main generator power distribution network. It has been actually applied to the design of the FPSO distribution network system, and controls the design, selection and procurement costs of more than 5,000 power cables in the hull part of the project alone, as well as the design costs of upstream distribution box switches. In actual ship applications, it greatly reduces the design costs of cables and distribution switch specifications, distribution box sizes and other design costs in the design, and reflects superior design innovation, which opens up a new design concept and a solid design basis for future design work in similar projects.

Claims

1. A new voltage drop design method for an integrated power distribution network, characterized in that: The total voltage drop from the voltage source to any device terminal point in the system is allowed to be within 6%, including the following steps: Step 1: The allowable voltage drop of the main incoming cable is 1.5%, that is, the allowable voltage drop from the module main generator (1) to the module high-voltage main switchboard (2) is within 1.5%; Step 2: The allowable voltage drop from the module high-voltage main distribution board (2) to the transformer is 4.5%, and the allowable voltage drop from the module high-voltage main distribution board (2) to the high-voltage equipment end is 4.5%; Step 3, the voltage drop from the module transformer (3) to the first module distribution panel (5) is allowed to be within 1.5%, and the voltage drop from the first module distribution panel (5) to the module load (4) is allowed to be 4.5%. The segmented voltage drop is allowed to be 1.5% and 4.5% respectively, and the total voltage drop is controlled to be within 6%; Step 4: The voltage drop from the module transformer (3) to the first module distribution panel (5) is allowed to be within 1.5%, the voltage drop from the first module distribution panel (5) to the module distribution box (6) is allowed to be within 2%, and the voltage drop from the module distribution box (6) to the module load (4) is allowed to be within 2.5%. The allowable values ​​of the segmented voltage drop are controlled to be 1.5%, 2%, and 2.5% respectively, and the total voltage drop is controlled to be within 6%; Step 5, the voltage drop from the module transformer (3) to the first module distribution panel (5) is allowed to be within 1.5%, the voltage drop from the first module distribution panel (5) to the second module distribution panel (7) is allowed to be 1.5%, and the voltage drop from the second module distribution panel (7) to the module transformer (3) is allowed to be within 3%. The allowable values ​​of the segmented voltage drop are controlled to be 1.5%, 1.5%, and 3% respectively, and the total voltage drop is controlled to be within 6%; Step 6, the allowable voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, the allowable voltage drop from the third module distribution board (8) to the remote module distribution box (9) is 3% adjustable, and the allowable voltage drop from the remote module distribution box (9) to the module load (4) is 2% adjustable. The allowable voltage drop values ​​of the controlled segments are 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled within 6%; Step 7, the allowable value of the voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, the allowable value of the voltage drop from the third module distribution board (8) to the near-end module distribution box (10) is 0.5%, the allowable value of the voltage drop from the near-end module distribution box (10) to the module junction box (11) is 3% adjustable, and the allowable value of the voltage drop from the module junction box (11) to the module load (4) is 2% adjustable. The allowable values ​​of the segmented voltage drop are controlled to be 0.5%, 0.5%, 3%, and 2% respectively, and the total voltage drop is controlled to be within 6%; Step 8: The allowable voltage drop from the module transformer (3) to the third module distribution board (8) is 0.5%, and the allowable voltage drop from the third module distribution board (8) to the module load (4) is 5.5%. The allowable voltage drops in each section are controlled to be 0.5% and 5.5% respectively, and the total voltage drop is controlled to be within 6%.

2. A novel voltage drop design method for an integrated power distribution network according to claim 1, characterized in that: In step 2, the allowable voltage drop from the module high-voltage main distribution board (2) to the transformer is 4.5%, that is, the allowable voltage drop from the module high-voltage main distribution board (2) to the module transformer (3) is 4.5%, and the allowable voltage drop from the module high-voltage main distribution board (2) to the hull transformer (14) is 4.5%.

3. A novel voltage drop design method for an integrated power distribution network according to claim 1, characterized in that: In step 2, the allowable voltage drop from the module high-voltage main distribution board (2) to the high-voltage equipment end is within 4.5%, that is, the allowable voltage drop from the module high-voltage main distribution board (2) to the module load (4) is within 4.5%.

4. A novel voltage drop design method for an integrated power distribution network, characterized in that: The total voltage drop from the voltage source to any device terminal point in the system is allowed to be within 6%, including the following steps: Step 1: The allowable value of the voltage drop of the main incoming cable is 0.5%, that is, the allowable value of the voltage drop from the hull main generator (12) to the hull main switchboard (13) is within 0.5%, and the allowable value of the voltage drop from the hull transformer (14) to the hull main switchboard (13) is within 0.5%; Step 2: The voltage drop from the ship's main switchboard (13) to the junction box (15) is allowed to be within 1.5%, the voltage drop from the junction box (15) to the ship's load (17) is allowed to be within 4%, the voltage drop on the power supply side is 0.5%, and the voltage drop in the power supply section is allowed to be 1.5% and 4% respectively, and the total voltage drop is controlled to be within 6%; Step 3: The voltage drop from the ship's main switchboard (13) to the starter (16) is allowed to be within 1.5%, the voltage drop from the starter (16) to the ship's load (17) is allowed to be within 4%, the voltage drop on the power supply side is 0.5%, and the voltage drop in the power supply section is allowed to be 1.5% and 4% respectively, and the total voltage drop is controlled to be within 6%; Step 4, the voltage drop from the hull main switchboard (13) to the hull load (17) is allowed to be within 5.5%; Step 5: The allowable voltage drop from the ship's main switchboard (13) to the ship's distribution box (18) is within 0.5%, the allowable voltage drop from the ship's distribution box (18) to the ship's load (17) is within 5%, and the allowable voltage drop of the power supply section is 0.5% and 5% respectively, and the total voltage drop is controlled within 5.5%; Step 6: The allowable voltage drop from the ship's main distribution board (13) to the ship's distribution box (18) is within 0.5%, the allowable voltage drop from the ship's distribution box (18) to the junction box (15) is within 2.5%, and the allowable voltage drop from the junction box (15) to the ship's load (17) is within 2.5%. The allowable voltage drop values ​​for the power supply sections are 0.5%, 2.5%, and 2.5%, respectively, and the total voltage drop is controlled to be within 5.5%.

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